Redox modulation of Ecto-NOX1 in human platelets

Abstract

By modulating the cellular redox state, the plasma membrane electron transport (PMET) is important in platelet biology; indeed, the oxidant/antioxidant balance plays a central role during activation of the coagulation pathway. None the less, in human platelets, the PMET system has not yet been fully characterized and the molecular identities of most components are unknown. Here, for the first time, the presence of the plasma membrane hydroquinone (NADH) oxidase Ecto-NOX1 in human platelets has been described. We found that Ecto-NOX1 expression is modulated by capsaicin: Indeed, it is positively regulated through a mechanism requiring binding of capsaicin to its receptor, namely the transient receptor potential vanilloid subtype 1 (TRPV1). Ligand-receptor interaction triggers a signalling cascade leading to ROS production, which in turn enhances expression and activity of Ecto-NOX1. Redox regulation of Ecto-NOX1 may be important to platelet recruitment and activation during inflammatory diseases.

Keywords::

• Plasma membrane electron transport
• vanilloid receptor 1
• reactive oxygen species

Acknowledgements

We are grateful to Prof. G. Mignogna and Dr A. Giorgi for assistance and useful discussion.

Declaration of interest: This work was supported by a grant from the Italian Ministry MIUR (Ministero dell'Istruzione, dell'Università e della Ricerca). The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.